United States STEM Activity! Now includes digital journals.Take your students on an educational journey to Ancient Greece with this complete lesson! Learn more about STEM Explorers here.STEM Story: Read the letter from fictitious travel guides explaining early roller coasters as well as kinetic and potential energy.Science Connection: Demonstrate the effects of gravity and potential and kinetic energyEngineering Challenge: Design a roller coasterSTEM Careers: Structural engineer and neuroscienti